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Table 2 Results of 24-h multi-channel intraluminal impedance and pH recording

From: Comparison of oesophageal function tests between Chinese non-erosive reflux disease and reflux hypersensitivity patients

Items NERD RH Independent-sample t-test or χ2test
n = 111 n = 92
DeMeester 23.4 ± 13.0 4.0 ± 6.6 P < 0.001
Acid exposure upright (%) 7.7 ± 6.1 1.4 ± 1.4 P < 0.001
Acid exposure recumbent (%) 4.8 ± 5.0 0.1 ± 0.2 P < 0.001
Acid exposure total (%) 6.1 ± 3.7 0.8 ± 0.8 P < 0.001
Bolus exposure upright (%) 3.9 ± 2.8 2.6 ± 2.0 P < 0.001
Bolus exposure recumbent (%) 1.2 ± 1.9 0.4 ± 0.7 P < 0.001
Bolus exposure total (%) 2.5 ± 2.1 1.5 ± 1.1 P < 0.001
Proximal acid event (n) 13.2 ± 10.5 9.7 ± 8.9 P = 0.011
Proximal nonacid event (n) 10.1 ± 9.2 11.6 ± 10.7 P = 0.284
Proximal total event (n) 23.4 ± 15.4 20.8 ± 16.8 P = 0.258
Distal acid reflux event (n) 25.3 ± 15.8 13.4 ± 11.2 P < 0.001
Distal nonacid reflux event (n) 19.5 ± 14.9 25.1 ± 15.2 P = 0.009
Distal total reflux event (n) 44.8 ± 24.7 38.5 ± 20.7 P = 0.051
PSPW index (%) 25.1 ± 9.5 32.6 ± 15.2 P < 0.001
MNBI (ohms) 1450.2 ± 750.8 2503.6 ± 964.1 P < 0.001
  1. NERD non-erosive reflux disease, RH reflux hypersensitivity PSPW index, post-reflux swallow-induced peristaltic wave index, MNBI mean nocturnal baseline impedance